The newer the system, the newer your OS should be as the OS is optimized for the latest computers. Years ago I bought Windows XP service pack 1. My computer couldn't run it and I was forced to underclock my older CPU so that it would work. Six months later, I upgraded the second iteration of XP and upgraded my CPU and moved the jumper so my computer would run at full speed. Oh how it ran! My newer CPU loved the latest OS.
Years ago I had a quandry. Buy the Commodore 64 or the IBM Desk PC which ran with a whopping 16 Meg of memory. As former Electronic Technician, I can tell you that the Commodore was actually a better computer in every way. However, IBM convinced the masses that the C64 was nothing more than a toy for hobbyists while only those who wanted a real machine would run the IBM and it's brand new OS called Windows 1.1. After my c64 literally burned up in a heap of plastic I switched to the IBM compatible. I had bought the timex sinclair with its 1K ram AND the 4 K ram expansion pack, a TI-99 (Texas Instruments) and had enough. I was switching to the biggest kid on the clock and stopped fighting the wind. I haven't really looked back since.
Miss B, Hornet, I respect your opinions and choices but you can't beat the biggest dog on the block. Join me and we'll rule the galaxy as, well not father and son but you get the idea.